Boring or like tool



Jan. 22, 1946. s Lc 2,393,424

BORINGO'R LIKE TOOL v Filed Jan. 11, 1945 2 Sheets-Shed 1 INVENTOR. Howard I Sela]? Bf g Attorney Jan. 22, 1946. H. I. SELCH 2,393,424

I BORING OR LIKE TOQL I Filed Jan. 11, 1945 2 Sheets-Sheet 2 32 549T 2 7 69-1 Will/f? 56 E!.\\\\\\\\\\\\\ B INVENTOR. floward 1'. belch BY gen Patented Jan. 22, 1946 v UNITED BORING R LI'KE' reon Howard I. Selch, Chicago, Ills Application January 11, 1945, Serial No. 572,392

6 Claims. (01. we -'91 This invention relates to improvements in poring or like rotary tools" and relates particulaily to a new drill br's'illlilar rotary tool and new chuck therefor; designed for use with each other to more economically and efliciently attain the desired result. In executin the current tremendous war building program the power driven drill, for example; is extensively used, particularly. in, the aircraft industry, and the present drills and chucks have proven very unsatisfactory. The chucks now in use with drills of known'co'nstructibfi are soon damaged and destrol a large ercentage' of the drills. resulting, not dilly in a; great tool loss, but also in a consi erable loss because of defective work, thusgreatly retarding the war building program.

To overcomethese difliculties, applicant has provided a special drill and chuck which can be used to advantage only in combination and which perfectly centers'the drill in the chuck, securely holds the drill iiiposition, prevents worn shanks on drills, eliminates chuck keys results in fewer bent drills, prevents drill wobblin'g and drill breakage.

Other objectsare to provide a chuck of greatly simplified construction which is composed .of Iew parts and which can be economically manufactured and will emciently' operate withoutthe use of jaws, keys, set screws or similarpart's.

These objects or'advanta'ges areattaine'd in a chuck and rotary tool unit of simple compact construction, the size of the unit being maintained. at a minimum. I

This application is a continuation part of application Serial No. 540,679, filed June 16'; 1944, now abandoned. p

The foregoing and other objects of therinvention will be manifest from the following brief description and the accompanying drawings.

Of the accompanying drawings; f

Figure l is a side elevationalview of a chuck constructed in accordance withi this invention, the same being shown with an improved drill operatively secured there'n'lt Figure 2 isa central longitudinal view of same taken as indicated by 'line' [-2 of Figure 1,.

Figure 3 is a cross-sectional view taken as'indicated by line 3-3 of Figure 1.

Figure 4 is an end view of the left hand portion of the drill chuck shown inFigures 1 and 2, .as'

viewed from the right thereof. I

Figure 5 is asidee1evationalview of a drill constructed in accordance with this invention.

Figure 6', is a longitudinal crossese'ction similar to Figure 2 of a" modified form or the invention. Figure 7 is a ,crosswsection taken on line 1'--'! of Figure, 6. Figure 8 is a longitudinal ci'gss' secti'on similar to Figure 2, of another modified form of the invention. V

Figure 911 a cross=section taken on line iii-9 of Figure 8.

Proceeding new to a detailed description 0: the particular adaptation of the invention illustrated in Figures 1 to 5'of the drawings, the drill Elias an enlarged cylindrical shank 1* which has a flattened side 8 or is ribbed, slotted orgother wise formed to be non-rotatably received h s chuck socket. The butt or inner end of the shank terminates ina conical surface or shoulder 9Rand the forward end of the shank is provided with a conical shoulder l0 .wliich'meets the main body of the drill 6. The conical ends of the shank are concentrically arranged relative to drill 6 and are oppositely disposed to form centering suria'ces, the purpose of which is hereinafter' described. In forming the'flattened side B'cnly a minor vpo'rtion'of the shank 1 i removed whereby the surfaces 9 and I0 extend circumferentially around the ends of the shank.

the drawings. there is shown archilQk y H which may be formed in one piece with a co; axially arranged socket l2 having a bottoni'w'all I13 conformingin shape and. adapted to receive the conical end 9 of the drill shank 1. The chuck body H is' offset smalle'r'adjacent the outer or tooi-receivingend thereof and the offset portion I4 is externally threaded. While thelscrew tlirea son the portiofis 14 are orthe ordinary or standard type, a quick thread or any suitable" thread maybe used.

The numeral portion Mon which it is operative-1y threaded. The cap is is ,prow'ded with a centrally'iiosi tioned axial opening I6 through which the'jniain body of the drill 6 projects. The cap [5" is provid d on the inner side thereof with a conical seat llwhich' is coai'tially arranged around the opening: 16 to receive the conical-shoulder ID on theiforward' end of thesh'ank' 1. The can" l5is operable; by'turning' it on threaded part l4 of chuck I I; to grip shank portion .l ofth'e' drill with-the opposed conical surfaces 9' and Ill thereof in self-centering engagement with the compleinental conical seats-Jaime n of" the chuck H and cap 15; respectively.

The" socket I2 is of the same crcss sectional shape asideshank 1 and, as'only a'm'inor poidenotes a cap havin arr in ternally threaded wallflfor receiving the" offset tion of the shank I is removed to form the flat side 3, the conical surface I extends circumferentially around the forwardly presented end of the shank I.

To facilitate the manufacture of the improved chuck, as shown in the drawings, it can be formed in two parts Ha and lib. The base part Ila is provided with an axial cylindrical boss which is snugly fitted into a correspondingl shaped recess I9in part lib. The part He is provided with a spindle socket 251, from which a relatively small bore 2| extends axially through boss I8.

The conical seat l3 which is the inner end wall of the socket I2 is formed on the end of the boss l8, and the boss is sweated, welded or otherwise fixedly secured in the recess ill to form what is in effect a one piece body Ii]. may be employed to form the chuck body I I having a socket [2 of irregular cross-section with an inner wall l3 forming a complete conicalseat.

f The bor'e 2| can be used as a knock-out bore. In case the shank 7 becomes rusted or otherwise stuck in the socket l2, a punch or other instrument may be'inse'rtedthrough the cavity 20 and bore 2| to force the shank therefrom.

rhe word drill is used to designate any other cutting tool adapted to be used with a shank 7 having the conical bearing surfaces 9 and I0 as shown. Other rotary tools which readily lend themselves to the present, invention are, as examples, reamers, grinders, threaders, router bits, end mills, etc.

. Referring to the modified form of the invention illustrated in Figures 6 and 7, the numeral 26 designates a drill having an enlarged shank portion 27 provided with an inner conical end or shoulder 28 and'an outer conical shoulder 29,

substantially like drill 6 in Figures 1 and 2. Drill 25, however, has a portion of its length adjacent shoulder 29 formed hexagonal in cross-section, as indicated at 38 in Figures 6 and '7, the remaining length of the shank being cylindrical in crosssection as indicated at 3]. The diameter of cylindrical shank portion 31 being equal to or less than the distance across flats of hexagonal shank portions30 (see Figure '7), said portion 31 will pass freely through the hexagonal portion 33 of the chuck.

A chuck 32, similar to chuck H, is provided at one end with an axial socket 33, at leasta portion of which is hexagonal in cross-section for freely slidably and non-rotatably receiving hexagonal shank portion 30', and the inner end of the socket being conical to provide a seat 34 for complementally receiving the conical inner shoulder 28. The socket 33 may be broached at 35 adjacent the inner end thereof to assure proper seating of said inner conical shoulder. The other end of the chuck is suitably internally threaded at 36 for mounting the same on a threaded stem of a power-driven device (not shown).

The socket or drill-receiving end of chuck 32 is reduced to provide a neck 37, which is provided with a threaded portion for quickly releasably receiving a cap 38 having an inner conical seat 39 for complementally receiving conical shoulder 29, an aperture Mi being provided for receiving the drill bod therethrough.

As before the arrangementis such that tightening the cap 38 on chuckv 32 will securely grip the elongated shank 27 with the inner and outer conical shoulders 28 and 29 thereof in complemental engagernentwith the conical seats 34 and 39 of the chuck 32 and cap 38, respectively. In

Other methods use of the unit, rotation of the drill relatively to the chuck is prevented by interfitting of hexagonal shank portion 32 in the hexagonal portion of socket 33.

In Figures 8 and 9 is shown another modification of the invention, in which the enlarged shank 2! of drill 26 is hexagonal in cross-section along its entire length between the inner and outer conical shoulder 28? and 29 respectively. This formof the invention being otherwise substantially the same as the construction shown in Figures 6 and '7, like parts are given like numerals.

It will be seen that each chuck and drill unit herein described forms in combination, a precision instrument which can be manufactured at a relatively low cost and which can be more economically used than boring tools of known construction.

In all forms of the invention described above the clearance between the enlar'gedQshank and the chuck socket isisufiicient to permit free reception of the shank in the socket, whereby is assured requisite self-centering action between the spaced conical shoulders of the shank and thecomplemental conical seats of the chuck and cap, but such clearance being sufficiently, close to preclude subsequent binding action between the complemental flats, which binding action might tend to throw the chuck, cap and tool out of concentricity.

Modifications of the invention may be resorted to without departing from'the spirit thereof or the scope of the appended claims.

What isclaimed is:

1. A device of the character described comprising a cutting tool havingtan enlarged shank portion provided on the perimeter thereof with at least one radially outwardly presented flattened side, said enlarged shank portion having conical shoulders at inner and outer terminal ends thereof, a chuck having a socket complemental in cross-section to the cross-sectionof said enlarged shank and including a flattened portion or portions complemental to the flattened side or sides of said cutting tool, I said socket nonrotatably. receiving said enlarged .shank, said socket terminating inwardly in a conical seat for complementallyr receiving said inner conical shoulder of the shank portion, and a cap releasabl secured to said chuck and having an aperture therein for receiving the tool body therethrough, said cap having an inner conical seat for complementally receiving said outer conical shoulder of the shank portion,:said cap being operable on said chuck to grip said shank portion with said conical shoulders thereof in self-centering engagement with therconical seats of said chuck and said cap. s V i i 2. A device of the character described comprising a cutting tool having an enlarged shank portion of polygonal, cross section, said enlarged shank portion having conical shoulders at inner and outer terminal ends, thereof, a chuck having a socket, complementalgin cross-section to the cross-section of said enlarged shank fornon-rotatably receiving the same,jsaid socket terminating inwardly in a conical. seat for complementally receiving said inner conicalshoulder of the shank portion, and a cap threaded onto said chuck and having an aperture therein for receiving the tool body therethrough, said cap having'an inner conical seat for complementally receiving said outer conical shoulder of theshank portion, said cap being operable on said chuck to grip said shank portion with said conical shoulders thereof in self-centering engagement with the conical seats of said chuck and said cap. 7

3. A device of the character described comprising a cutting tool havingan enlarged shank portion a part of the length of which is of polygonal cross-section, said enlarged shank portion having conical shoulders at inner and outer terminal ends thereof, a chuck having a socket-complemental in cross-section to the cross-section of said enlarged shank for non-rotatably receiving the same, said socket terminating inwardly in a conical seat for complementally receiving said 5. A device of the character described comprising a cutting tool having an enlarged shank portion at least a part of the length of which is hexagonal in cross-section, said enlarged shank portion having conical shouldersat inner and outer terminal ends thereof, a chuck having a socket of which at least a part of the length thereof is complemental in cross-section to said hexagonal part of said shank portion for non-rotatably receiving the same, said socket terminating inwardly in a conical seat for complementally receiving said inner conical shoulder of the shank portion, and a cap threaded onto said chuck and inner conical shoulder of the shank portion, and

a cap threaded onto said chuck and having an aperture therein for receiving the tool body therethrough, said cap having an inner conical seat for complementally receiving said outer conical shoulder of the shank portion, said cap being operable onsaid chuck to grip said shank portion with said conical shoulders thereof in self-centering engagement with the conical seats of said chuck and said cap.

4. A device of the character described comprising a cutting tool having an enlarged shank portion of which at least a part of the length thereof is of polygonal cross-section, said enlarged shank portion having conical shoulders at inner and outer terminal ends thereof, a chuck having a socket of which at least a part of the length thereof is complemental in cross-section to said polygonal part of said shank portion for non-rotatably receiving the same, said socket terminating inwardl in a conical seat for complementally receiving said inner conical shoulder of the shank portion, and a cap threaded onto said chuck and having an aperture therein for receiving the tool body therethrough, said-cap having an inner conical seat for complementally receiving said outer conical shoulder of the shank portion, said cap being operable on said chuck to grip said shank portion with said conical shoulthe conical seats of said chuck and said cap.

having an aperture therein for receiving the tool body therethrough, saidcap having an inner conical seat for complementally receiving said outer conical shoulder of the shank portion, said cap being operable on said chuck to grip said shank portion with said conical shoulders thereof in self-centering engagement with the conical seats of said chuck and said cap.

'6. In a boring tool, the combination of a drill having an enlarged shank portion provided with a flat side, said shank portion having a butt end terminating in a conical surface, the forwardly presented end of said shank portion tapering to the drill body to form a shoulder having a curcumferentiallyextending conical surface; and a chuck having an axially directed bore of the same cross-sectional shape as said shank, said bore terminating in a complete conical surface for exactly receiving the butt end of said shank; and a cap threaded on the forwardly presented end portion of said chuck, said cap having an axial 5 bore for receiving the drill body and provided on sented conical shoulder on said shank, said can operable against said shoulder to securely hold 40 said drillin a coaxial position in said chuck.

HOWARD I. smcn. 

